1. Phylum Echinodermata

2. Echinoderms Echino = spiny Derm = skin
Examples: starfish, sea urchins, sea cucumbers, sand dollars
echinoderms
shape of life echino

3. Brittle stars

4. Sea urchins

5. Sea cucumber

6. Starfish or sea stars

7. Sea lilies

8. Sand dollars

9. Crinoids

10. General Characteristics
All live in salt water near the shore or on the bottom
Have an exoskeleton made of calcium carbonate
Coelom: the true body cavity is adapted into a water-vascular system
Can regenerate their arms, tentacles, spines and intestines

11. Regeneration

12. Body Plan Pentaradial symmetry Aboral (top) side contains anus
Oral (bottom) side contains mouth and tube feet

13. Digestion Digestion: mouth stomach  intestine anus
Mouth and stomach can extend outside of the body to start digesting prey
Scavengers, filter feeders, or active predators
eating echinoderms
sea stars eating
starfish eating

14. Circulation Circulation: no circulatory system
the coelom is adapted into a water-vascular system that circulates nutrients, blood and gases

15. Respiration
Respiration: breathe through tube feet and/or gills

16. Nervous System Nervous System: no brain
Nerves run from the central disk to all other parts of the body
Some have light sensitive eye spots

17. Movement
Movement: move by tube feet located on the oral side

18. Reproduction Reproduction: sexual: Dioecious, mating or spawning
Asexual: hermaphrodites: reproduce by fission or regeneration
starfish regenerating

19. Ecological Importance
Food source for many other animals
Eat decaying matter in the oceans
Some are poisonous to humans
crown of thorns starfish

20. Class Asteroidea 5-50 arms Can live up to 30 years
Predators or scavengers
Examples: starfish (also called sea stars)

21. Purple Stars

22. Sunflower Star

23. Red Knob Sea Star

24. Chocolate chip star fish

25. Red Sea Star

26. Cushion Sea Star

27. Class Ophiuroidea Largest class Long spindly legs Filter feeders
Examples: Brittle stars, basket stars
basket starfish

28. Brittle Stars

29. Brittle Stars

30. Basket Star

31. Basket Star

32. Class Crinoidea Smallest class Have a stalk to attach to the sea floor
Examples: Sea lilies and feather stars
sea lilies

33. Feather Stars feather stars

34. Feather Stars

35. Feather Stars

36. Sea Lilies

37. Sea Lilies

38. Class Holothuroidea Have elongated body with tentacles
Eat decaying matter
Ex. Sea cucumbers

40. Spotted Sea Cucumber

41. Eyed Sea Cucumber

42. Horrid Sea Cucumber

43. Pineapple Sea Cucumber

44. Spotted Cucumber
sea cucumber ejecting guts
sea cucumbers
seacucumber

45. Class Echinoidea Have spines that can be ejected as weapons
Ex: Sea urchins, sand dollars
1Sea Urchin Info
sand dollar
sand dollar moving
live sand dollar

46. Long-spined Urchin

47. Banded Sea Urchin

48. Short Spined Sea Urchin

49. Toxic Sea Urchin

50. Sand Dollars

51. Sand Dollars

53. Heart Urchin

54. Heart Urchin